<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>transition</title>
    <script src="../js/vue.min.js"></script>

</head>

<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.14.1/lodash.min.js"></script>
<div id="list-complete-demo" class="demo">
    <button v-on:click="shuffle">Shuffle</button>
    <button v-on:click="add">Add</button>
    <button v-on:click="remove">Remove</button>
    <transition-group name="list-complete" tag="p">
    <span
            v-for="item in items"
            v-bind:key="item"
            class="list-complete-item"
    >
      {{ item }}
    </span>
    </transition-group>
</div>
<style>
    .list-complete-item {
        transition: all 1s;
        display: inline-block;
        margin-right: 10px;
    }
    .list-complete-enter, .list-complete-leave-active {
        opacity: 0;
        transform: translateY(30px);
    }
    .list-complete-leave-active {
        position: absolute;
    }
</style>
<script>
    new Vue({
        el: '#list-complete-demo',
        data: {
            items: [1,2,3,4,5,6,7,8,9],
            nextNum: 10
        },
        methods: {
            randomIndex: function () {
                return Math.floor(Math.random() * this.items.length)
            },
            add: function () {
                this.items.splice(this.randomIndex(), 0, this.nextNum++)
            },
            remove: function () {
                this.items.splice(this.randomIndex(), 1)
            },
            shuffle: function () {
                this.items = _.shuffle(this.items)
            }
        }
    })
</script>
</body>
</html>
